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Fair Value of the Purchaser and Non-Purchaser Warrants at Issuance (Details) (USD $)
 12 Months Ended
Sep. 30, 2014
Amendment Agreements [Member]  
Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 1 3.13%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreezGSixQbqThreeSixdDlB
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 2 29.58avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreeSixgTPXFmcmEightwy
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 3 100.71%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreekWCgOnedxrggEightw
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 4 0.00%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreeNCCfWThreeQqXSevenhl
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Embedded conversion options and warrants [Member]  
Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 1 3.21%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreeyFhBQFNineKfSevenJh
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 2 0.10%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreePsflKQPREightbEightFour
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 3 29.48avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreeHSixFourFourZPGdsLNineg
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 4 1.25avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreefNLkwgnSSFHNine
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 5 100.07%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreeKZZeroOneWFourSCgFZP
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 6 77.51%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreesLThreeSWmTBTwoWSevenQ
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 7 0.184avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreeFourTwogTTPtNinerrqThree
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 8 0.65avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreeHHKWqzLwrXhD
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 9 0.00%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreeJTwBlzKzCSpd
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 10 0.00%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreegKVSixXTOnefkqvP
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